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 Chemistry Questions

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Q:

When iron rusts, its weight .....

A) decreases B) increases
C) remains the same D) first increases and then decreases
 
Answer & Explanation Answer: B) increases

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0 1810
Q:

Which one of the following is a physical change?

A) Burning of coal B) Burning of wood
C) Heating of a platinum crucible D) Heating of potassium chlorate
 
Answer & Explanation Answer: C) Heating of a platinum crucible

Explanation:

In Burning of coal, burning of wood and Heating of Potassium Chlorate there will be some sort of chemical change, but Heating of a Platinum crucible is a physical change.

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1 1809
Q:

Heat is transmitted from higher temperature to lower temperature through the actual motion of the molecules in

A) Conduction B) Convection
C) Radiation D) Both conduction and convection
 
Answer & Explanation Answer: B) Convection

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1 1806
Q:

Isotones have always ______

A) Same number of protons B) Same atomic number
C) Same number of neutron D) Same number of proton and same numbe of neutron
 
Answer & Explanation Answer: C) Same number of neutron

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1 1803
Q:

______________ is a multibranched polysaccharide of glucose that serves as a form of energy storage in animals and fungi.

A) B) Glycogen
C) Pectin D) Chitin
 
Answer & Explanation Answer: B) Glycogen

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1 1801
Q:

Name the acid present in lemon.

A) Phosphoric acid B) Carbonic acid
C) Citric acid D) Malic acid
 
Answer & Explanation Answer: C) Citric acid

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1 1801
Q:

What is the process of rust forming on iron called?

A) Rusting B) Crystallisation
C) Shovel D) Spade
 
Answer & Explanation Answer: A) Rusting

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Q:

The chemical formula of Ammonia is _____ .

A) NH B) NH1
C) NH2 D) NH3
 
Answer & Explanation Answer: D) NH3

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